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Title: Investigation into the feasibility of a soft muon experiment

Issues relevant in a soft ({lt} 5 GeV) muon pair experiment at the AGS or the RHIC central region are investigated. Observation of direct muon pairs is difficult because the muon pair to pion ratio is {omicron} (10{sup {minus}4}). Absorber penetration is the only means available to identify high energy muons among a large number of hadrons. Three important sources of background are sail-through hadrons that fail to interact in the absorber, the decays of pions and kaons to muons in the absorber, and leakage of hadronic shower products through the absorber. An absorber thick enough to limit the ratio of combinatorical background pairs to pions to {omicron} (10{sup {minus}4}) imposes a significant muon kinetic energy threshold due to muon range in the absorber. Absorbers with low atomic number Z are preferred to keep this threshold low, and to avoid loss of invariant mass resolution due to energy loss straggling and multiple coulomb scattering. Long-lived meson to muon decays can be directly suppressed only by picking an absorber with short interaction length, which implies a high density, high Z material. With sufficiently high statistics, a subtraction of the spectra of like-sign pairs from the spectrum of opposite-sign pairs should recovermore » the direct muon pair spectrum. 9 refs., 9 figs., 2 tabs.« less
Authors:
Publication Date:
OSTI Identifier:
6688483
Report Number(s):
CONF-900331-13
ON: DE90015541; TRN: 90-025519
DOE Contract Number:
AC05-84OR21400
Resource Type:
Conference
Resource Relation:
Conference: Workshop on heavy ion physics at the alternating gradient synchrotron, Upton, NY (USA), 3-7 Mar 1990
Research Org:
Oak Ridge National Lab., TN (USA)
Sponsoring Org:
DOE/ER
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; KAONS; WEAK PARTICLE DECAY; MUON PAIRS; MUON DETECTION; PIONS; DISTRIBUTION FUNCTIONS; REST MASS; TRANSVERSE MOMENTUM; BOSONS; CHARGED PARTICLE DETECTION; DECAY; DETECTION; ELEMENTARY PARTICLES; FUNCTIONS; HADRONS; LINEAR MOMENTUM; MASS; MESONS; PARTICLE DECAY; PSEUDOSCALAR MESONS; RADIATION DETECTION; STRANGE MESONS; STRANGE PARTICLES 645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties